Motor-vehicle.



A. LINDNER.

FEED SCREW ADJUSTING MECHANISM.

APPLICATION FILED AUGJ, 191e.

Patented Sept. 4, 1917.

.narran sra'ras raraarr carica.

.ALLEN LOOMIS, 0F DETROIT, MICHIGAN, ASSIGNOR TO PACKARD MOTR CAR C0111- PANY, 0F DETROIT, l.lVIlCI-IIGAN, A CORPORATION 0F MICHIGAN.

MOTOR-VEHICLE.

Specification of Letters Patent.

Patented Sept. f1, 1311"?,

Application led December 9, 1912. Serial No.735,728.

To all whom t may concern:

Be it known that I, ALLEN Loomis, a` citizen of theUnited States, and resident of Detroit, lVayne county, State of Michigan, have invented certain new and useful llmprovements in Motor-Vehicles, of which the following is a specification.

This invention relates to motor vehicles, and particularly to thebraking mechanism thereof.

The salient object of the invention is the production of a brake for the driving mechanism of a vehicle which will be efficient,

' easily applied, simple" in construction, selfadjustable for .\vear, and be quiet or free from rattle. The lnventlon 1s shown as applied to a brake operatin on a drum secured to the transmissionshail of the vehicle, the brake being applied by the operator through a foot lever. Y

, With a view to obtaining these and' other objects, the invention consists in the features of construction and arrangement' of parts, hereinafter more fully described and specied in the claims.

Referring to the drawings, f'

Figure 1 is a side elevation of the gear casing of a motor vehicle showing an embodiment of the invention mounted thereon;

Fig. 2 is a plan View of the invention illustrated in Fig. 1;

Fi 3 is a transverse section approxi- -mate y on the line 3 3 of Fig. 1;

Fig. 4 is a detail view; and j Fig. 5 is a sectionapproximately on the line 5 5. of Fig. 1.

' The gear casing or gear box of a motor vehicle is illustrated in elevation at 10 in Fig. 1, and the transmission shaft 11 extends lthrough the rear end of the casing and has secured to it a brake drum 12. The propeller shaft 13 is connected to the shaft 11 through a suitable universal joint, which may be inclosed in the housin 14.

The casing 10, together Wit an extension bracket 15, may be said to form a support for the braking mechanism, and the bracket 15 is somewhat cylindrical in form and surrounds the brake and brake drum, being provided, however, with openings 16 to permit a freer circulation of air or cooling the brake.

The brake proper is in the form of a -lexible band 17, which has a suitable linin 18 of Woven asbestos, or other, material, an

theends of the band cross, as shown in 3, and are pvoted to terminal or slide blocks 19 and 19.

Au eiicient means of pivoting-cuco' the ends of the band to the block if) is shown in detail in Fig. 4, in which the end of the band 17 is bent around a filler block 20 and riveted, as at 2l, the filler block being pierced b v the pivot bolt 22, which is supported in the slide block 19.

An anchor for the ends of the brake band is mounted in projections 23 on the bracket 15, this anchor being in the form ot' a slide bar 24 having a center stop The blocks 19 aud 19 are arranged to slide on the bar 2l ou opposite sides of the stop "25, the stop vthus limiting their movement in one directiono nly. Thus when `the drum 12 is rotated 1n the direct-ion of the arrow shown in Fig. 3, if the brake band 17 is slightly con-A tracted, the drum will tend to carry the band around with it and the block 19 will abut against the stop 25 and thus form an anchor for the end of the band 17 that is secured to said block. When the drum 12 is rotated in the opposite directionand the brake band is slightly contracted, the drum tends to carry the band around with it and the block` 19 thereby abuts against the stop 25 and the end of the brake band that is secured' to said block 19 becomes the anchored end. In either case it requires but slight exertion on the part of the operator in contracting the band about the drum to produce considerable braking effect, due to the wrapping action of the band about the druml 'Bv this construction, therefore, the same Wrapping action is obtained, no matter in which direction the brake drum is rotating.

Each of the blocks 19 and 19 is provided with a Slot 26, in which rollers 27 are pivotally mounted, and a brake operating device 28 in the form of a double cam is adapted to cooperate with these rollers 27 tocontract and expand the 'band 17. This device 28 has a plate portion 29, in which is a l!- shaped slot 30 in which the rollers 27 operate, asshown particularly in 1. The operatin part or rod 31 of the device 28 extends orwardly and is pivoted at 32 to an arm 33 of the brake pedal lever 34, Which lever is pivotally mounted at 35 on a bracket 36 on the gear casing 10. A spring'37 an- MND to the operating device 28 at the point 32 tends to draw the operating device forwardly into the position shown in Fig. 1, which is the inoperative position of the brake.

The bracket 15 is provided with a series of adjustable stops 39, which practically surroundthe brake band 17, and against pan'ded and thereby held in its inoperative ,1.0 position. Thus it will be observed that the spring 37 draws the operating device 28 forwardly and thus the cam plate 29 brings the blocks 19 and 19 close together, which expands the brake band 17 against the y l stops 39. A spring 40 is provided on the -bar 24 between the sliding block 19 and the upper projection 23 for the purpose of taking up i any lost motion in the partsl and thereby preventin the brake from rattling under v, the vibration of the vehicle.

i LA specific embodiment of the invention l. --b'odiment will be specifically claimed, but j 25i'twil1 be understood that the invention is 'Ilot'. limited to the exact details of construetion herein shown, as it will be apparent that various changes may be made without departing from the spirlt and scope of the vention. j Having thus described my invention, what claim and'desre to secure by Letters Pat- 1."In 4a brake mechanism the combination a support,- abrake drum, a brake band coerfjatingv withjsaid drum, a slide bar on said A pportada'pted to anchor either' end of said ibandblocks, to which the ends of the brake ndgaresecured, mounted to reciprocate lgitu'dinzally'-of said bar, and means indeeuden'tor'g4 said slide bar for contracting and-pesi'tively expanding said band relat' ely'Qtofsaiddrum. 2.1-1'11 a Amotor vehicle, the combination y h'ftlie gear casing, the driving shaft proectingth'eretrom, and Vthe brake drum on dfslijaftj. of a brake band coperating with aid-`-'drum an anchor for said band supi P ,ltfedjon said casing and adapted to anchor her'end-ofjsaid band, and a device indeeri'dent yoffsaid anchor for positively niev- "gtlifeends of said band toward and from ther, saidjdcvice being movably supd-'-beiveen the ends of said band and dto swing therewith without aiiieeteir'eiiativc position ot said ends. 5 .L'Ina .motor vehicle, the combination tintherefrom, and the brake drum on aft, ofa `brake band surrounding said fdrum', Aanjanehor for said band supported 'on'sai'd'easing'and adapted to anchor either' hd'ofsaid .band, 'and a double wedge-shaped 'ileii'ihly supported and adapted to cone yband about said drum.

which the brake band is adapted to be eX-l ;'h'as been described in detail, and this em" band surroundin the gear casing, the driving shaft pro- 4. In a brake mechanism the combination of a support, a brake drum, a brake band surrounding said drum, an anchor on said support adapted to holdy each end of said band against movement in one direction while permitting it to be moved in the other direction, a device independent of said anchor for positively moving the ends of said band relative toeaeh other to therebycontract the band about the drum, and means adapted to retract said device to thereby expand said band away from said drum.

5. In a brake mechanism, the combination of a support, a brake drum, a split band cooperating with said drum, a series of adjust- 30 able stops adjacent said band4 and against which said band is adapted to rest whenin inoperative position, a member adapted to be inserted between the ends of said band VJfor moving the same against said drum, and a g5l spring adapted tp retract said member and move said band into inoperative position against said stops.

6,. In a brake mechanism, the combination of a support, a brake drum, a, brake band surroundingsaid drum, slide blocks for the ends of said band, an anchor on said support comprising a slide bar for said blocks, means secured against movement relatively to said bar' to hold each of said blocks 95 against sliding in one| dir-Action while-permitting them to slide in the other direction, and a double cam device for moving said blocks relative to each other.

7. In a brake mechanism, the combination of a support, a brake drum, a brake f said drum, slide blocks for the ends of said bands, an anchor on said support comprising a slide bar upon which said blocks are mounted, said bar having a stop arranged between said blocks for limiting their movement toward each other, and a double cam device for' separating said blocks and thereby contracting said band about said drum.

8. In a brake mechanism, the combina-v tion of 'a support, a brake drum, a brake band surroundin said drum, slide blocks for the ends of said bands, an anchor on said support comprising a slide bar upon which said Vblocks are mounted, said bar having a stop arranged between said blocks for limitingl their movement toward each other, 'a double cam device for separating said blocks and thereby contracting said band about 12o said drum, and a spring on said slide bar for taking Iup the slack in` the parts and pre- I venting rattle.

9. In a brake mechanism the combination of a support, a brake drum, a brake band surrounding said drum, an anchor on said support adapted to hold cach end of said baud against movement in one vdirection while permitting it to be moved in the other direction, a double cam device operating. at

isA

right angles to the plane of rotation of said drum, a lever pivoted to said support and to said cam device for operating the latter, and a spring for retracting said cam device, said cam device being supported Wholly by said lever and the band which it operates.

10. In a brake mechanism, the combination of asupport, a brake drum, a brake band surrounding said drum, slide blocks for 'the ends of said band, ananchor on said support comprising a slide bar for said blocks, a roller mounted on each of said blocks and a double cam adapted to engage said rollers and reciprocate said blocks.

11. In a brake'mechanism, the combinablocks, slots in said blocks7 rollers in said 20v slots and a double cam reciprocating in said slots adapted to engage said rollers and separate said blocks and thereby contract the band around the brake drum.

In testimony whereof I afHX my signature 25 in the presence of two witnesses.

ALLEN LOOMIS. Witnesses:

W. G. GERNANDT, JOHN D. WILSON. 

